4 * Common NFSv4 ACL handling code.
6 * Copyright (c) 2002, 2003 The Regents of the University of Michigan.
9 * Marius Aamodt Eriksen <marius@umich.edu>
10 * Jeff Sedlak <jsedlak@umich.edu>
11 * J. Bruce Fields <bfields@umich.edu>
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. Neither the name of the University nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
27 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
28 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
29 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
33 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 #include <linux/string.h>
40 #include <linux/slab.h>
41 #include <linux/list.h>
42 #include <linux/types.h>
44 #include <linux/module.h>
45 #include <linux/nfs_fs.h>
46 #include <linux/posix_acl.h>
47 #include <linux/nfs4.h>
48 #include <linux/nfs4_acl.h>
51 /* mode bit translations: */
52 #define NFS4_READ_MODE (NFS4_ACE_READ_DATA)
53 #define NFS4_WRITE_MODE (NFS4_ACE_WRITE_DATA | NFS4_ACE_APPEND_DATA)
54 #define NFS4_EXECUTE_MODE NFS4_ACE_EXECUTE
55 #define NFS4_ANYONE_MODE (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL | NFS4_ACE_SYNCHRONIZE)
56 #define NFS4_OWNER_MODE (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL)
58 /* We don't support these bits; insist they be neither allowed nor denied */
59 #define NFS4_MASK_UNSUPP (NFS4_ACE_DELETE | NFS4_ACE_WRITE_OWNER \
60 | NFS4_ACE_READ_NAMED_ATTRS | NFS4_ACE_WRITE_NAMED_ATTRS)
62 /* flags used to simulate posix default ACLs */
63 #define NFS4_INHERITANCE_FLAGS (NFS4_ACE_FILE_INHERIT_ACE \
64 | NFS4_ACE_DIRECTORY_INHERIT_ACE | NFS4_ACE_INHERIT_ONLY_ACE)
66 #define NFS4_SUPPORTED_FLAGS (NFS4_INHERITANCE_FLAGS | NFS4_ACE_IDENTIFIER_GROUP)
68 #define MASK_EQUAL(mask1, mask2) \
69 ( ((mask1) & NFS4_ACE_MASK_ALL) == ((mask2) & NFS4_ACE_MASK_ALL) )
72 mask_from_posix(unsigned short perm, unsigned int flags)
74 int mask = NFS4_ANYONE_MODE;
76 if (flags & NFS4_ACL_OWNER)
77 mask |= NFS4_OWNER_MODE;
79 mask |= NFS4_READ_MODE;
81 mask |= NFS4_WRITE_MODE;
82 if ((perm & ACL_WRITE) && (flags & NFS4_ACL_DIR))
83 mask |= NFS4_ACE_DELETE_CHILD;
84 if (perm & ACL_EXECUTE)
85 mask |= NFS4_EXECUTE_MODE;
90 deny_mask(u32 allow_mask, unsigned int flags)
92 u32 ret = ~allow_mask & ~NFS4_MASK_UNSUPP;
93 if (!(flags & NFS4_ACL_DIR))
94 ret &= ~NFS4_ACE_DELETE_CHILD;
98 /* XXX: modify functions to return NFS errors; they're only ever
99 * used by nfs code, after all.... */
101 /* We only map from NFSv4 to POSIX ACLs when setting ACLs, when we err on the
102 * side of being more restrictive, so the mode bit mapping below is
103 * pessimistic. An optimistic version would be needed to handle DENY's,
104 * but we espect to coalesce all ALLOWs and DENYs before mapping to mode
108 low_mode_from_nfs4(u32 perm, unsigned short *mode, unsigned int flags)
110 u32 write_mode = NFS4_WRITE_MODE;
112 if (flags & NFS4_ACL_DIR)
113 write_mode |= NFS4_ACE_DELETE_CHILD;
115 if ((perm & NFS4_READ_MODE) == NFS4_READ_MODE)
117 if ((perm & write_mode) == write_mode)
119 if ((perm & NFS4_EXECUTE_MODE) == NFS4_EXECUTE_MODE)
120 *mode |= ACL_EXECUTE;
123 struct ace_container {
124 struct nfs4_ace *ace;
125 struct list_head ace_l;
128 static short ace2type(struct nfs4_ace *);
129 static int _posix_to_nfsv4_one(struct posix_acl *, struct nfs4_acl *, unsigned int);
130 static struct posix_acl *_nfsv4_to_posix_one(struct nfs4_acl *, unsigned int);
131 int nfs4_acl_add_ace(struct nfs4_acl *, u32, u32, u32, int, uid_t);
132 static int nfs4_acl_split(struct nfs4_acl *, struct nfs4_acl *);
135 nfs4_acl_posix_to_nfsv4(struct posix_acl *pacl, struct posix_acl *dpacl,
138 struct nfs4_acl *acl;
142 (posix_acl_valid(pacl) < 0 || pacl->a_count == 0)) ||
144 (posix_acl_valid(dpacl) < 0 || dpacl->a_count == 0)))
147 acl = nfs4_acl_new();
154 error = _posix_to_nfsv4_one(pacl, acl,
155 flags & ~NFS4_ACL_TYPE_DEFAULT);
161 error = _posix_to_nfsv4_one(dpacl, acl,
162 flags | NFS4_ACL_TYPE_DEFAULT);
172 acl = ERR_PTR(error);
178 nfs4_acl_add_pair(struct nfs4_acl *acl, int eflag, u32 mask, int whotype,
179 uid_t owner, unsigned int flags)
183 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
184 eflag, mask, whotype, owner);
187 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
188 eflag, deny_mask(mask, flags), whotype, owner);
192 /* We assume the acl has been verified with posix_acl_valid. */
194 _posix_to_nfsv4_one(struct posix_acl *pacl, struct nfs4_acl *acl,
197 struct posix_acl_entry *pa, *pe, *group_owner_entry;
200 int eflag = ((flags & NFS4_ACL_TYPE_DEFAULT) ?
201 NFS4_INHERITANCE_FLAGS : 0);
203 BUG_ON(pacl->a_count < 3);
204 pe = pacl->a_entries + pacl->a_count;
205 pa = pe - 2; /* if mask entry exists, it's second from the last. */
206 if (pa->e_tag == ACL_MASK)
207 mask_mask = deny_mask(mask_from_posix(pa->e_perm, flags), flags);
211 pa = pacl->a_entries;
212 BUG_ON(pa->e_tag != ACL_USER_OBJ);
213 mask = mask_from_posix(pa->e_perm, flags | NFS4_ACL_OWNER);
214 error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_OWNER, 0, flags);
219 while (pa->e_tag == ACL_USER) {
220 mask = mask_from_posix(pa->e_perm, flags);
221 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
222 eflag, mask_mask, NFS4_ACL_WHO_NAMED, pa->e_id);
227 error = nfs4_acl_add_pair(acl, eflag, mask,
228 NFS4_ACL_WHO_NAMED, pa->e_id, flags);
234 /* In the case of groups, we apply allow ACEs first, then deny ACEs,
235 * since a user can be in more than one group. */
239 if (pacl->a_count > 3) {
240 BUG_ON(pa->e_tag != ACL_GROUP_OBJ);
241 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
242 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
243 NFS4_ACL_WHO_GROUP, 0);
247 group_owner_entry = pa;
248 mask = mask_from_posix(pa->e_perm, flags);
249 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
250 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
251 NFS4_ACL_WHO_GROUP, 0);
256 while (pa->e_tag == ACL_GROUP) {
257 mask = mask_from_posix(pa->e_perm, flags);
258 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
259 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask_mask,
260 NFS4_ACL_WHO_NAMED, pa->e_id);
264 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE,
265 NFS4_ACE_IDENTIFIER_GROUP | eflag, mask,
266 NFS4_ACL_WHO_NAMED, pa->e_id);
274 pa = group_owner_entry;
275 mask = mask_from_posix(pa->e_perm, flags);
276 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
277 NFS4_ACE_IDENTIFIER_GROUP | eflag,
278 deny_mask(mask, flags), NFS4_ACL_WHO_GROUP, 0);
282 while (pa->e_tag == ACL_GROUP) {
283 mask = mask_from_posix(pa->e_perm, flags);
284 error = nfs4_acl_add_ace(acl, NFS4_ACE_ACCESS_DENIED_ACE_TYPE,
285 NFS4_ACE_IDENTIFIER_GROUP | eflag,
286 deny_mask(mask, flags), NFS4_ACL_WHO_NAMED, pa->e_id);
292 if (pa->e_tag == ACL_MASK)
294 BUG_ON(pa->e_tag != ACL_OTHER);
295 mask = mask_from_posix(pa->e_perm, flags);
296 error = nfs4_acl_add_pair(acl, eflag, mask, NFS4_ACL_WHO_EVERYONE, 0, flags);
303 sort_pacl_range(struct posix_acl *pacl, int start, int end) {
305 struct posix_acl_entry tmp;
307 /* We just do a bubble sort; easy to do in place, and we're not
308 * expecting acl's to be long enough to justify anything more. */
311 for (i = start; i < end; i++) {
312 if (pacl->a_entries[i].e_id
313 > pacl->a_entries[i+1].e_id) {
315 tmp = pacl->a_entries[i];
316 pacl->a_entries[i] = pacl->a_entries[i+1];
317 pacl->a_entries[i+1] = tmp;
324 sort_pacl(struct posix_acl *pacl)
326 /* posix_acl_valid requires that users and groups be in order
330 if (pacl->a_count <= 4)
331 return; /* no users or groups */
333 while (pacl->a_entries[i].e_tag == ACL_USER)
335 sort_pacl_range(pacl, 1, i-1);
337 BUG_ON(pacl->a_entries[i].e_tag != ACL_GROUP_OBJ);
339 while (pacl->a_entries[j].e_tag == ACL_GROUP)
341 sort_pacl_range(pacl, i, j-1);
346 nfs4_acl_nfsv4_to_posix(struct nfs4_acl *acl, struct posix_acl **pacl,
347 struct posix_acl **dpacl, unsigned int flags)
349 struct nfs4_acl *dacl;
355 dacl = nfs4_acl_new();
359 error = nfs4_acl_split(acl, dacl);
363 if (acl->naces == 0) {
368 *pacl = _nfsv4_to_posix_one(acl, flags);
370 error = PTR_ERR(*pacl);
375 if (dacl->naces == 0) {
376 if (pacl == NULL || *pacl == NULL)
382 *dpacl = _nfsv4_to_posix_one(dacl, flags);
383 if (IS_ERR(*dpacl)) {
384 error = PTR_ERR(*dpacl);
390 posix_acl_release(*pacl);
399 * While processing the NFSv4 ACE, this maintains bitmasks representing
400 * which permission bits have been allowed and which denied to a given
402 struct posix_ace_state {
407 struct posix_user_ace_state {
409 struct posix_ace_state perms;
412 struct posix_ace_state_array {
414 struct posix_user_ace_state aces[];
418 * While processing the NFSv4 ACE, this maintains the partial permissions
419 * calculated so far: */
421 struct posix_acl_state {
422 struct posix_ace_state owner;
423 struct posix_ace_state group;
424 struct posix_ace_state other;
425 struct posix_ace_state everyone;
426 struct posix_ace_state mask; /* Deny unused in this case */
427 struct posix_ace_state_array *users;
428 struct posix_ace_state_array *groups;
432 init_state(struct posix_acl_state *state, int cnt)
436 memset(state, 0, sizeof(struct posix_acl_state));
438 * In the worst case, each individual acl could be for a distinct
439 * named user or group, but we don't no which, so we allocate
440 * enough space for either:
442 alloc = sizeof(struct posix_ace_state_array)
443 + cnt*sizeof(struct posix_ace_state);
444 state->users = kzalloc(alloc, GFP_KERNEL);
447 state->groups = kzalloc(alloc, GFP_KERNEL);
448 if (!state->groups) {
456 free_state(struct posix_acl_state *state) {
458 kfree(state->groups);
461 static inline void add_to_mask(struct posix_acl_state *state, struct posix_ace_state *astate)
463 state->mask.allow |= astate->allow;
467 * Certain bits (SYNCHRONIZE, DELETE, WRITE_OWNER, READ/WRITE_NAMED_ATTRS,
468 * READ_ATTRIBUTES, READ_ACL) are currently unenforceable and don't translate
469 * to traditional read/write/execute permissions.
471 * It's problematic to reject acls that use certain mode bits, because it
472 * places the burden on users to learn the rules about which bits one
473 * particular server sets, without giving the user a lot of help--we return an
474 * error that could mean any number of different things. To make matters
475 * worse, the problematic bits might be introduced by some application that's
476 * automatically mapping from some other acl model.
478 * So wherever possible we accept anything, possibly erring on the side of
479 * denying more permissions than necessary.
481 * However we do reject *explicit* DENY's of a few bits representing
482 * permissions we could never deny:
485 static inline int check_deny(u32 mask, int isowner)
487 if (mask & (NFS4_ACE_READ_ATTRIBUTES | NFS4_ACE_READ_ACL))
491 if (mask & (NFS4_ACE_WRITE_ATTRIBUTES | NFS4_ACE_WRITE_ACL))
496 static struct posix_acl *
497 posix_state_to_acl(struct posix_acl_state *state, unsigned int flags)
499 struct posix_acl_entry *pace;
500 struct posix_acl *pacl;
504 nace = 4 + state->users->n + state->groups->n;
505 pacl = posix_acl_alloc(nace, GFP_KERNEL);
507 return ERR_PTR(-ENOMEM);
509 pace = pacl->a_entries;
510 pace->e_tag = ACL_USER_OBJ;
511 error = check_deny(state->owner.deny, 1);
514 low_mode_from_nfs4(state->owner.allow, &pace->e_perm, flags);
515 pace->e_id = ACL_UNDEFINED_ID;
517 for (i=0; i < state->users->n; i++) {
519 pace->e_tag = ACL_USER;
520 error = check_deny(state->users->aces[i].perms.deny, 0);
523 low_mode_from_nfs4(state->users->aces[i].perms.allow,
524 &pace->e_perm, flags);
525 pace->e_id = state->users->aces[i].uid;
526 add_to_mask(state, &state->users->aces[i].perms);
530 pace->e_tag = ACL_GROUP_OBJ;
531 error = check_deny(state->group.deny, 0);
534 low_mode_from_nfs4(state->group.allow, &pace->e_perm, flags);
535 pace->e_id = ACL_UNDEFINED_ID;
536 add_to_mask(state, &state->group);
538 for (i=0; i < state->groups->n; i++) {
540 pace->e_tag = ACL_GROUP;
541 error = check_deny(state->groups->aces[i].perms.deny, 0);
544 low_mode_from_nfs4(state->groups->aces[i].perms.allow,
545 &pace->e_perm, flags);
546 pace->e_id = state->groups->aces[i].uid;
547 add_to_mask(state, &state->groups->aces[i].perms);
551 pace->e_tag = ACL_MASK;
552 low_mode_from_nfs4(state->mask.allow, &pace->e_perm, flags);
553 pace->e_id = ACL_UNDEFINED_ID;
556 pace->e_tag = ACL_OTHER;
557 error = check_deny(state->other.deny, 0);
560 low_mode_from_nfs4(state->other.allow, &pace->e_perm, flags);
561 pace->e_id = ACL_UNDEFINED_ID;
565 posix_acl_release(pacl);
566 return ERR_PTR(error);
569 static inline void allow_bits(struct posix_ace_state *astate, u32 mask)
571 /* Allow all bits in the mask not already denied: */
572 astate->allow |= mask & ~astate->deny;
575 static inline void deny_bits(struct posix_ace_state *astate, u32 mask)
577 /* Deny all bits in the mask not already allowed: */
578 astate->deny |= mask & ~astate->allow;
581 static int find_uid(struct posix_acl_state *state, struct posix_ace_state_array *a, uid_t uid)
585 for (i = 0; i < a->n; i++)
586 if (a->aces[i].uid == uid)
590 a->aces[i].uid = uid;
591 a->aces[i].perms.allow = state->everyone.allow;
592 a->aces[i].perms.deny = state->everyone.deny;
597 static void deny_bits_array(struct posix_ace_state_array *a, u32 mask)
601 for (i=0; i < a->n; i++)
602 deny_bits(&a->aces[i].perms, mask);
605 static void allow_bits_array(struct posix_ace_state_array *a, u32 mask)
609 for (i=0; i < a->n; i++)
610 allow_bits(&a->aces[i].perms, mask);
613 static void process_one_v4_ace(struct posix_acl_state *state,
614 struct nfs4_ace *ace)
616 u32 mask = ace->access_mask;
619 switch (ace2type(ace)) {
621 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
622 allow_bits(&state->owner, mask);
624 deny_bits(&state->owner, mask);
628 i = find_uid(state, state->users, ace->who);
629 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
630 allow_bits(&state->users->aces[i].perms, mask);
632 deny_bits(&state->users->aces[i].perms, mask);
633 mask = state->users->aces[i].perms.deny;
634 deny_bits(&state->owner, mask);
638 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
639 allow_bits(&state->group, mask);
641 deny_bits(&state->group, mask);
642 mask = state->group.deny;
643 deny_bits(&state->owner, mask);
644 deny_bits(&state->everyone, mask);
645 deny_bits_array(state->users, mask);
646 deny_bits_array(state->groups, mask);
650 i = find_uid(state, state->groups, ace->who);
651 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
652 allow_bits(&state->groups->aces[i].perms, mask);
654 deny_bits(&state->groups->aces[i].perms, mask);
655 mask = state->groups->aces[i].perms.deny;
656 deny_bits(&state->owner, mask);
657 deny_bits(&state->group, mask);
658 deny_bits(&state->everyone, mask);
659 deny_bits_array(state->users, mask);
660 deny_bits_array(state->groups, mask);
664 if (ace->type == NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE) {
665 allow_bits(&state->owner, mask);
666 allow_bits(&state->group, mask);
667 allow_bits(&state->other, mask);
668 allow_bits(&state->everyone, mask);
669 allow_bits_array(state->users, mask);
670 allow_bits_array(state->groups, mask);
672 deny_bits(&state->owner, mask);
673 deny_bits(&state->group, mask);
674 deny_bits(&state->other, mask);
675 deny_bits(&state->everyone, mask);
676 deny_bits_array(state->users, mask);
677 deny_bits_array(state->groups, mask);
682 static struct posix_acl *
683 _nfsv4_to_posix_one(struct nfs4_acl *n4acl, unsigned int flags)
685 struct posix_acl_state state;
686 struct posix_acl *pacl;
687 struct nfs4_ace *ace;
690 ret = init_state(&state, n4acl->naces);
694 list_for_each_entry(ace, &n4acl->ace_head, l_ace)
695 process_one_v4_ace(&state, ace);
697 pacl = posix_state_to_acl(&state, flags);
707 nfs4_acl_split(struct nfs4_acl *acl, struct nfs4_acl *dacl)
709 struct list_head *h, *n;
710 struct nfs4_ace *ace;
713 list_for_each_safe(h, n, &acl->ace_head) {
714 ace = list_entry(h, struct nfs4_ace, l_ace);
716 if (ace->type != NFS4_ACE_ACCESS_ALLOWED_ACE_TYPE &&
717 ace->type != NFS4_ACE_ACCESS_DENIED_ACE_TYPE)
720 if (ace->flag & ~NFS4_SUPPORTED_FLAGS)
723 switch (ace->flag & NFS4_INHERITANCE_FLAGS) {
725 /* Leave this ace in the effective acl: */
727 case NFS4_INHERITANCE_FLAGS:
728 /* Add this ace to the default acl and remove it
729 * from the effective acl: */
730 error = nfs4_acl_add_ace(dacl, ace->type, ace->flag,
731 ace->access_mask, ace->whotype, ace->who);
738 case NFS4_INHERITANCE_FLAGS & ~NFS4_ACE_INHERIT_ONLY_ACE:
739 /* Add this ace to the default, but leave it in
740 * the effective acl as well: */
741 error = nfs4_acl_add_ace(dacl, ace->type, ace->flag,
742 ace->access_mask, ace->whotype, ace->who);
754 ace2type(struct nfs4_ace *ace)
756 switch (ace->whotype) {
757 case NFS4_ACL_WHO_NAMED:
758 return (ace->flag & NFS4_ACE_IDENTIFIER_GROUP ?
759 ACL_GROUP : ACL_USER);
760 case NFS4_ACL_WHO_OWNER:
762 case NFS4_ACL_WHO_GROUP:
763 return ACL_GROUP_OBJ;
764 case NFS4_ACL_WHO_EVERYONE:
771 EXPORT_SYMBOL(nfs4_acl_posix_to_nfsv4);
772 EXPORT_SYMBOL(nfs4_acl_nfsv4_to_posix);
777 struct nfs4_acl *acl;
779 if ((acl = kmalloc(sizeof(*acl), GFP_KERNEL)) == NULL)
783 INIT_LIST_HEAD(&acl->ace_head);
789 nfs4_acl_free(struct nfs4_acl *acl)
792 struct nfs4_ace *ace;
797 while (!list_empty(&acl->ace_head)) {
798 h = acl->ace_head.next;
800 ace = list_entry(h, struct nfs4_ace, l_ace);
810 nfs4_acl_add_ace(struct nfs4_acl *acl, u32 type, u32 flag, u32 access_mask,
811 int whotype, uid_t who)
813 struct nfs4_ace *ace;
815 if ((ace = kmalloc(sizeof(*ace), GFP_KERNEL)) == NULL)
820 ace->access_mask = access_mask;
821 ace->whotype = whotype;
824 list_add_tail(&ace->l_ace, &acl->ace_head);
837 .stringlen = sizeof("OWNER@") - 1,
838 .type = NFS4_ACL_WHO_OWNER,
842 .stringlen = sizeof("GROUP@") - 1,
843 .type = NFS4_ACL_WHO_GROUP,
846 .string = "EVERYONE@",
847 .stringlen = sizeof("EVERYONE@") - 1,
848 .type = NFS4_ACL_WHO_EVERYONE,
853 nfs4_acl_get_whotype(char *p, u32 len)
857 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
858 if (s2t_map[i].stringlen == len &&
859 0 == memcmp(s2t_map[i].string, p, len))
860 return s2t_map[i].type;
862 return NFS4_ACL_WHO_NAMED;
866 nfs4_acl_write_who(int who, char *p)
870 for (i = 0; i < ARRAY_SIZE(s2t_map); i++) {
871 if (s2t_map[i].type == who) {
872 memcpy(p, s2t_map[i].string, s2t_map[i].stringlen);
873 return s2t_map[i].stringlen;
880 EXPORT_SYMBOL(nfs4_acl_new);
881 EXPORT_SYMBOL(nfs4_acl_free);
882 EXPORT_SYMBOL(nfs4_acl_add_ace);
883 EXPORT_SYMBOL(nfs4_acl_get_whotype);
884 EXPORT_SYMBOL(nfs4_acl_write_who);